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List:       linux-tegra
Subject:    [PATCH] ARM: tegra: fix emmc on specific bootloaders
From:       Peter Geis <pgwipeout () gmail ! com>
Date:       2020-12-28 14:33:20
Message-ID: 20201228143321.1863250-1-pgwipeout () gmail ! com
[Download RAW message or body]

Ouya fails to detect the emmc module when booting from specific bootloaders.
Fastboot and hard-kexec bootloaders have observed failures while u-boot does not have \
this issue. It was discovered that if the sdmmc4 alternate configuration clock pin is \
input disabled the issue manifests. Ouya uses sdmmc4 in the primary pin configuration \
so it is unknown why this occurs. It is likely related to the other emmc limitations \
we have on Ouya.

For now, fix it by enabling input on cam_mclk_pcc0.

Fixes: d7195ac5c9c5 ("ARM: tegra: Add device-tree for Ouya")
Signed-off-by: Peter Geis <pgwipeout@gmail.com>
Reported-by: Matt Merhar <mattmerhar@protonmail.com>
Tested-by: Matt Merhar <mattmerhar@protonmail.com>
---
 arch/arm/boot/dts/tegra30-ouya.dts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm/boot/dts/tegra30-ouya.dts b/arch/arm/boot/dts/tegra30-ouya.dts
index 74da1360d297..0368b3b816ef 100644
--- a/arch/arm/boot/dts/tegra30-ouya.dts
+++ b/arch/arm/boot/dts/tegra30-ouya.dts
@@ -4352,8 +4352,8 @@ cam_mclk_pcc0 {
 		nvidia,pins = "cam_mclk_pcc0";
 		nvidia,function = "vi_alt3";
 		nvidia,pull = <TEGRA_PIN_PULL_NONE>;
-		nvidia,tristate = <TEGRA_PIN_ENABLE>;
-		nvidia,enable-input = <TEGRA_PIN_DISABLE>;
+		nvidia,tristate = <TEGRA_PIN_DISABLE>;
+		nvidia,enable-input = <TEGRA_PIN_ENABLE>;
 	};
 	pcc1 {
 		nvidia,pins = "pcc1";
-- 
2.25.1


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